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- /*
- * Asterisk -- An open source telephony toolkit.
- *
- * Resource limits
- *
- * Copyright (c) 2006 Tilghman Lesher. All rights reserved.
- *
- * Tilghman Lesher <res_limit_200607@the-tilghman.com>
- *
- * This code is released by the author with no restrictions on usage.
- *
- */
- /*! \file
- *
- * \brief Resource limits
- *
- * \author Tilghman Lesher <res_limit_200607@the-tilghman.com>
- */
- /*** MODULEINFO
- <support_level>core</support_level>
- ***/
- #include "asterisk.h"
- ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
- #include <ctype.h>
- #include <sys/time.h>
- #include <sys/resource.h>
- #include "asterisk/module.h"
- #include "asterisk/cli.h"
- /* Find proper rlimit for virtual memory */
- #ifdef RLIMIT_AS
- #define VMEM_DEF RLIMIT_AS
- #else
- #ifdef RLIMIT_VMEM
- #define VMEM_DEF RLIMIT_VMEM
- #endif
- #endif
- static const struct limits {
- int resource;
- char limit[3];
- char desc[40];
- char clicmd[15];
- } limits[] = {
- { RLIMIT_CPU, "-t", "cpu time", "time" },
- { RLIMIT_FSIZE, "-f", "file size" , "file" },
- { RLIMIT_DATA, "-d", "program data segment", "data" },
- { RLIMIT_STACK, "-s", "program stack size", "stack" },
- { RLIMIT_CORE, "-c", "core file size", "core" },
- #ifdef RLIMIT_RSS
- { RLIMIT_RSS, "-m", "resident memory", "memory" },
- { RLIMIT_MEMLOCK, "-l", "amount of memory locked into RAM", "locked" },
- #endif
- #ifdef RLIMIT_NPROC
- { RLIMIT_NPROC, "-u", "number of processes", "processes" },
- #endif
- { RLIMIT_NOFILE, "-n", "number of file descriptors", "descriptors" },
- #ifdef VMEM_DEF
- { VMEM_DEF, "-v", "virtual memory", "virtual" },
- #endif
- };
- static int str2limit(const char *string)
- {
- size_t i;
- for (i = 0; i < ARRAY_LEN(limits); i++) {
- if (!strcasecmp(string, limits[i].clicmd))
- return limits[i].resource;
- }
- return -1;
- }
- static const char *str2desc(const char *string)
- {
- size_t i;
- for (i = 0; i < ARRAY_LEN(limits); i++) {
- if (!strcmp(string, limits[i].clicmd))
- return limits[i].desc;
- }
- return "<unknown>";
- }
- static char *complete_ulimit(struct ast_cli_args *a)
- {
- int which = 0, i;
- int wordlen = strlen(a->word);
- if (a->pos > 1)
- return NULL;
- for (i = 0; i < ARRAY_LEN(limits); i++) {
- if (!strncasecmp(limits[i].clicmd, a->word, wordlen)) {
- if (++which > a->n)
- return ast_strdup(limits[i].clicmd);
- }
- }
- return NULL;
- }
- static char *handle_cli_ulimit(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
- {
- int resource;
- struct rlimit rlimit = { 0, 0 };
- switch (cmd) {
- case CLI_INIT:
- e->command = "ulimit";
- e->usage =
- "Usage: ulimit {data|"
- #ifdef RLIMIT_RSS
- "limit|"
- #endif
- "file|"
- #ifdef RLIMIT_RSS
- "memory|"
- #endif
- "stack|time|"
- #ifdef RLIMIT_NPROC
- "processes|"
- #endif
- #ifdef VMEM_DEF
- "virtual|"
- #endif
- "core|descriptors} [<num>]\n"
- " Shows or sets the corresponding resource limit.\n"
- " data Process data segment [readonly]\n"
- #ifdef RLIMIT_RSS
- " lock Memory lock size [readonly]\n"
- #endif
- " file File size\n"
- #ifdef RLIMIT_RSS
- " memory Process resident memory [readonly]\n"
- #endif
- " stack Process stack size [readonly]\n"
- " time CPU usage [readonly]\n"
- #ifdef RLIMIT_NPROC
- " processes Child processes\n"
- #endif
- #ifdef VMEM_DEF
- " virtual Process virtual memory [readonly]\n"
- #endif
- " core Core dump file size\n"
- " descriptors Number of file descriptors\n";
- return NULL;
- case CLI_GENERATE:
- return complete_ulimit(a);
- }
- if (a->argc > 3)
- return CLI_SHOWUSAGE;
- if (a->argc == 1) {
- char arg2[15];
- const char * const newargv[2] = { "ulimit", arg2 };
- for (resource = 0; resource < ARRAY_LEN(limits); resource++) {
- struct ast_cli_args newArgs = { .argv = newargv, .argc = 2 };
- ast_copy_string(arg2, limits[resource].clicmd, sizeof(arg2));
- handle_cli_ulimit(e, CLI_HANDLER, &newArgs);
- }
- return CLI_SUCCESS;
- } else {
- resource = str2limit(a->argv[1]);
- if (resource == -1) {
- ast_cli(a->fd, "Unknown resource\n");
- return CLI_FAILURE;
- }
- if (a->argc == 3) {
- int x;
- #ifdef RLIMIT_NPROC
- if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_NPROC && resource != RLIMIT_FSIZE) {
- #else
- if (resource != RLIMIT_NOFILE && resource != RLIMIT_CORE && resource != RLIMIT_FSIZE) {
- #endif
- ast_cli(a->fd, "Resource not permitted to be set\n");
- return CLI_FAILURE;
- }
- sscanf(a->argv[2], "%30d", &x);
- rlimit.rlim_max = rlimit.rlim_cur = x;
- setrlimit(resource, &rlimit);
- return CLI_SUCCESS;
- } else {
- if (!getrlimit(resource, &rlimit)) {
- char printlimit[32];
- const char *desc;
- if (rlimit.rlim_max == RLIM_INFINITY)
- ast_copy_string(printlimit, "effectively unlimited", sizeof(printlimit));
- else
- snprintf(printlimit, sizeof(printlimit), "limited to %d", (int) rlimit.rlim_cur);
- desc = str2desc(a->argv[1]);
- ast_cli(a->fd, "%c%s (%s) is %s.\n", toupper(desc[0]), desc + 1, a->argv[1], printlimit);
- } else
- ast_cli(a->fd, "Could not retrieve resource limits for %s: %s\n", str2desc(a->argv[1]), strerror(errno));
- return CLI_SUCCESS;
- }
- }
- }
- static struct ast_cli_entry cli_ulimit =
- AST_CLI_DEFINE(handle_cli_ulimit, "Set or show process resource limits");
- static int unload_module(void)
- {
- return ast_cli_unregister(&cli_ulimit);
- }
- static int load_module(void)
- {
- return ast_cli_register(&cli_ulimit) ? AST_MODULE_LOAD_DECLINE : AST_MODULE_LOAD_SUCCESS;
- }
- AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Resource limits");
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